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a ir rs 12 Soil structure is critical for the seed germination, growth of plants, and water and contaminants transport. Soil function of scale that defines soil structure (Dexter, 1988). size distribution obtained by mechanical sieving. Ma-zurak (1950) suggested that the geometric mean ARTICLE IN PRESSDistribution of aggregates of different sizes, abbreviated to aggregate-size distribution, is a consequence of soil structure and is a potentially useful way, even if not Baldock and Kay (1987) used the following power function to describe the cumulative percentage of aggregates by weight less than a characteristic linearA scale is needed to quantify soil structure variation. diameter Dgm may be more appropriate. More recently